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Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. In
this respiration organ is reduced, but still respiration takes place in the
cavity. That is why it is also called the snail’s respiratory cavity.The snails’ gills look like a double comb, with a stem and feathery protrusions that are responsible for the general process of gas exchange: The absorption of oxygen from the water and the diffusion of carbon dioxide into the water. Those comb-like built gills are called ctenidia.The following points highlight the top two types of respiration in mollusca. The types are: 1. Aquatic Respiration 2. Terrestrial Respiration.
How do snails exchange gas?
The snails’ gills look like a double comb, with a stem and feathery protrusions that are responsible for the general process of gas exchange: The absorption of oxygen from the water and the diffusion of carbon dioxide into the water. Those comb-like built gills are called ctenidia.
What are various modes of respiration in mollusks?
The following points highlight the top two types of respiration in mollusca. The types are: 1. Aquatic Respiration 2. Terrestrial Respiration.
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Do molluscs have a specialized gas exchange system?
Mollusk gills are called ctenidia, and they are made up of a series of thin filaments of tissue that resemble the teeth of a comb. These filaments absorb oxygen from water and transfer it to the blood stream. They also receive carbon dioxide from the blood and release it into the surrounding water.
What type of circulatory system do mollusks have?
Mollusks possess an open circulatory system in which body fluid (hemolymph) is transported largely within sinuses devoid of distinct epithelial walls.
Do molluscs have lungs?
Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. That is why it is also called the snail’s respiratory cavity.
How do snails take in oxygen?
Like all living things, snails need to breathe oxygen. Land snails have a very simple breathing system which is located in a small cavity between their shells and their bodies. Air enters into this cavity through a small opening or pore on the side of the snail’s body, just underneath the bottom edge of the shell.
What is the excretory system of Mollusca?
The excretory organs of Mollusca are metanephridia. A molluscan body is found to be unsegmented. However, they do have a distinct head, a muscular foot, and a visceral hump. A soft and spongy layer of skin covers the visceral hump to form a mantle.
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Gas exchange is the function of the respiratory system. Blood carries carbon dioxide to the gills. There it is released into the water passing over the gills.
What is pulmonary respiration in Mollusca?
The gill hangs within the mantle cavity that is used to exchange oxygen and carbon dioxide during respiration. Gills are also used for filter-feeding apart from respiration in some bivalves. Moreover, the pulmonary sac or pulmonary cavity is an organ used for aerial respiration. This is present in the land molluscs.
Do mollusks have trachea?
Trachea: In some Pulmonata, the pulmonary chamber gives off breathing air-tubes, called trachea.
Which of the following accurately describes gas exchange in mollusks?
Which of the following accurately describes gas exchange in mollusks? Ciliated gills propel water through the mantle cavity, where ctenidia extract oxygen and carbon dioxide is carried away.
What kind of structure do all mollusks use for obtaining oxygen?
gill, in biology, type of respiratory organ found in many aquatic animals, including a number of worms, nearly all mollusks and crustaceans, some insect larvae, all fishes, and a few amphibians.
Why do molluscs have open circulatory system?
Mollusks have an open circulatory system, meaning the blood does not circulate entirely within vessels but is collected from the gills, pumped through the heart, and released directly into spaces in the tissues from which it returns to the gills and then to the heart.
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Why do mollusks need gills?
Gills are used to exchange oxygen and carbon dioxide in respiration. Cilia on the gills create a flow of oxygenated water through the mantle cavity, carrying off carbon dioxide and nitrogenous wastes. Bivalves like oysters and clams, have greatly enlarged gills that they use for both respiration and filter feeding.
Do all mollusks have gills?
Most molluscs have only one pair of gills, or even only a singular gill. Generally, the gills are rather like feathers in shape, although some species have gills with filaments on only one side. They divide the mantle cavity so water enters near the bottom and exits near the top.
Do snails have open or closed circulatory system?
A snail’s circulation basically is open. That means that snails may have some important blood vessels, such as the pulmonary vein, leading from the lung to the heart, and the main artery or aorta, but the blood circulates freely between the organs.
What do snails use for breathing?
Most species of aquatic snail have a comb-like gill. The oldest groups have two gills but the majority have lost one, to make room inside their spiral shell. As snails moved to the land, they swapped gills for a primitive lung, called the pallial cavity.
What is the respiratory system of snail?
Essentially, all snails, to some degree, breathe through their skin and the gills which are situated in the palatial cavity.
How do mollusks excrete nitrogenous waste?
The vast majority of mollusks are aquatic and excrete nitrogen in the form of ammonia. In octopuses, however, nitrogen is excreted as ammonium chloride, which is quite strongly concentrated in the urine. Terrestrial snails and slugs excrete uric acid but may also excrete ammonia when living in moist surroundings.
Why does the snail not need to pump air into its small lung?
They use oxygen for the same reason that we do – to breathe, grow, reproduce, and convert food into energy. DIfferent snail species have different kinds of breathing techniques. Some respire with the help of gills, whereas some inhale air through the breathing hole located inside their mantle.
How do marine snails breathe?
Most snails that live in salt water respire using a gill or gills; a few species, though, have a lung, are intertidal, and are active only at low tide when they can move around in the air.
Do slugs bleed blood?
But slugs/snails and most other mollusks have blood that is called HEMOCYANIN. The proteins in slug blood carry COPPER atoms instead of iron. They too attract oxygen. The copper gives the blood a bluish green color.
How do most mollusks breathe?
Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water. Mollusks have a circulatory system with one or two hearts that pump blood.
Gas exchange
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How do Mollusca excrete waste from the body?
The excretory system of mollusks is made up of tubular organs called nephridia that filter waste from internal body fluids. Waste generated by cells within the organism is dumped into the coelom, the fluid-filled internal body cavity. The nephridia are small tubes that open into the coelom.
What do molluscs use for excretion?
Mollusks have a coelom and a complete digestive system. Their excretory system consists of tube-shaped organs called nephridia (see Figure above). The organs filter waste from body fluids and release the waste into the coelom. Terrestrial mollusks exchange gases with the surrounding air.
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